id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6128	rolling_variance addition	Pieter Ober <jaapaap@…>	Eric Niebler	"LS,

I have just finished writing an implementation and test of a 
rolling_variance which I would be happy to contribute to the framework.

It includes a redone version of rolling_mean which avoids potential overflow and accuracy issues. The rolling_variance currently returns zero when there are less than 2 samples available.

I'd be happy to do assist to make this fit the accumulator framework better and I include a first draft of the code. Nothing spectacular, but I have not seen the 'rolling' version being published anywhere in the exact form needed, making this non-trivial to implement anyway.

- Pieter"	Bugs	new	To Be Determined	accumulator	Boost 1.47.0	Not Applicable